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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2009 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
/*
* The Monmap Monitor is used to track the monitors in the cluster.
*/
#ifndef CEPH_MONMAPMONITOR_H
#define CEPH_MONMAPMONITOR_H
#include <map>
#include <set>
using namespace std;
#include "include/types.h"
#include "msg/Messenger.h"
#include "PaxosService.h"
#include "MonMap.h"
#include "MonitorDBStore.h"
#include "Monitor.h"
class MMonGetMap;
class MMonMap;
class MMonCommand;
class MMonJoin;
class MonmapMonitor : public PaxosService {
public:
MonmapMonitor(Monitor *mn, Paxos *p, const string& service_name)
: PaxosService(mn, p, service_name)
{
}
MonMap pending_map; //the pending map awaiting passage
void create_initial();
void update_from_paxos(bool *need_bootstrap);
void create_pending();
void encode_pending(MonitorDBStore::Transaction *t);
// we always encode the full map; we have no use for full versions
virtual void encode_full(MonitorDBStore::Transaction *t) { }
void on_active();
void dump_info(Formatter *f);
bool preprocess_query(PaxosServiceMessage *m);
bool prepare_update(PaxosServiceMessage *m);
bool preprocess_join(MMonJoin *m);
bool prepare_join(MMonJoin *m);
bool preprocess_command(MMonCommand *m);
bool prepare_command(MMonCommand *m);
void get_health(list<pair<health_status_t,string> >& summary,
list<pair<health_status_t,string> > *detail) const;
int get_monmap(bufferlist &bl);
int get_monmap(MonMap &m);
/*
* Since monitors are pretty
* important, this implementation will just write 0.0.
*/
bool should_propose(double& delay);
void tick();
struct C_MonmapCommand : public Monitor::C_Command {
utime_t last_changed;
C_MonmapCommand(Monitor *_mon, MMonCommand *_m, int r,
string s, version_t v, utime_t changed) :
Monitor::C_Command(_mon, _m, r, s, v),
last_changed(changed)
{ }
void finish(int r) {
int ret = r;
if (r == -EAGAIN) {
MonMap m;
mon->monmon()->get_monmap(m);
if ((m.get_epoch() == version+1)
&& (m.last_changed == last_changed)) {
ret = 0;
}
}
Monitor::C_Command::finish(ret);
}
};
private:
bufferlist monmap_bl;
};
#endif
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